Preamble
This guide will walk you through how to create gerber files in Altium. Gerber files consist of all the different layers in your PCB, and are sent to PCB manufacturers so that they can actually build your circuit board.
Step 1
Click on Gerber Files to open the gerber file wizard.
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Step 10
Navigate into the project output folder, which is created in the same directory where you have saved the project file. You will need to select the gerber files and the NC Drill file you've made according to [Manufacturer Name Here]. You may have to zip these files before sending them to the manufacturer. You should name the archive the same name as the PCB.
Or alternatively, you could do this: